Add User model.

priv/repo/migrations/20230805173950_create_users.exs

@@ -0,0 +1,14 @@
+defmodule LinkShortener.Repo.Migrations.CreateUsers do
+  use Ecto.Migration
+
+  def change do
+    create table(:users) do
+      add :email, :string
+      add :encrypted_password, :string
+
+      timestamps()
+    end
+
+    create unique_index(:users, [:email])
+  end
+end